|An investigation of unipolar arcing at atmospheric pressure in Aluminum 2024 and aluminum coated glass slides. - Woodson, Steven Wayne.|
Available from National Technical Information Service, Springfield, Va
Keywords: ALUMINUM ALLOYS; EROSION; ELECTRIC ARCS; PLASMAS (PHYSICS)
|REALIZATION OF ADAPTIVE CONTROL ALGORITHMS WITH THE AID OF ONBOARD DIGITAL COMPUTERS - ALEKSEEV, K. B.|
A DISCUSSION IS PRESENTED ON THE PRACTICAL FACTORS WHICH MUST BE CONSIDERED DURING SYNTHESIS OF ADAPTIVE CONTROL ALGORITHMS ENSUING OPTIMAL VALUES OF A SPECIFIC CONTROL SYSTEM. THE STUDY IS LIMITED TO FLIGHT VEHICLE CONTROL SYSTEMS WITH ONBOARD DIGITAL COMPUTERS. THE CHOICE OF A MOST SUITABLE TYPE OF DIGITAL COMPUTER IS SHOWN TO DEPEND ON THE COMPLEXITY OF REQUIRED ALGORITHMS, PROCESS RATES, NECESSARY DEGREE OF ACCURACY, WEIGHT AND GEOMETRY RESTRICTIONS, AND ADAPTABILITY TO OTHER COMPUTATIONAL C...
Keywords: ELECTRIC ARCS; SHOCK TUNNELS; FLUID FLOW; HEAT TRANSFER; SHOCK TUBES
|Development and Applications of a Modular Parallel Process for Large Scale Fluid/Structures Problems - Guruswamy, Guru P.|
A modular process that can efficiently solve large scale multidisciplinary problems using massively parallel super computers is presented. The process integrates disciplines with diverse physical characteristics by retaining the efficiency of individual disciplines. Computational domain independence of individual disciplines is maintained using a meta programming approach. The process integrates disciplines without affecting the combined performance...
Keywords: RADIATIVE TRANSFER; ELECTRIC ARCS; GAS DENSITY; SHOCK TUBES; ELECTRON DENSITY (CONCENTRATION); HELIUM; HYDROGEN; SHOCK WAVES
|Kinetics and catalysts of formaldehyde conensation - Krylov, O. V., et al|
Comparative tests on kinetics of formaldehyde condensation in presence of calcium hydroxide
Keywords: ATMOSPHERIC ELECTRICITY; ELECTRIC WIRE; LIGHTNING; SPACECRAFT LAUNCHING; ELECTRIC ARCS; ELECTRIC CONDUCTORS; PYROTECHNICS
|Hydrogen cavitation performance of 80.6 deg helical inducer with blunt leading edges - Meng, P. R.|
Cavitating and noncavitating performance of helical inducer with blunt blade leading edges in liquid hydrogen
Keywords: ELECTRIC ARCS; METAL WORKING; SPOT WELDS; ARC WELDING; ELECTRIC WELDING; WELDED JOINTS
|THE RATE OF PROPAGATION OF ULTRASONIC WAVES IN HUNGARIAN ROCKS, AND ITS CORRELATION WITH OTHER PHYSICAL AND CHEMICAL ROCK CHARACTERISTICS - OTTLIK, P|
ULTRASONIC WAVE PROPAGATION IN CARBONACEOUS AND SILICEOUS ROCKS
Keywords: ARC DISCHARGES; ARC WELDING; ELECTRON BEAM WELDING; ELECTRIC ARCS; PRODUCT DEVELOPMENT
|Stabilization of dc arcs in static argon atmospheres for use in spectrochemical analysis - Gordon, W. A|
Metal cathodes in argon atmospheres used to stabilize dc arcs for spectrochemical analysis
Keywords: ARGON; RHENIUM; STABILIZATION; TANTALUM; TUNGSTEN; CATHODES; ELECTRIC ARCS; SPECTRUM ANALYSIS; GAS DYNAMICS; GRAPHITE; MOLYBDENUM; NIOBIUM; PLATINUM
|Optical Rain Gauge Performance: Second Workshop on Optical Rain Gauge Measurements - NON|
The primary focus of the workshop was on the performance and reliability of STi mini-Optical Rain Gauges in a number of environments, including deployments on ships and buoys in the western equatorial Pacific Ocean during the TOGA/COARE field experiment, deployments on buoys in U.S. coastal waters, and comparisons with other types of rain gauges on the Virginia coast and in Florida. The workshop was attended by 20 investigators, representing 10 different institutions, who gathered to present new...
Keywords: DAMAGE; ELECTRIC ARCS; ELECTRIC WIRE; ELECTRICAL INSULATION; PYROLYTIC MATERIALS; KAPTON (TRADEMARK); LOW VOLTAGE; PYROLYSIS; WIRING
|Development of microchannel plate x-ray optics - Kaaret, Philip|
The goal of this research program was to develop a novel technique for focusing x-rays based on the optical system of a lobster's eye. A lobster eye employs many closely packed reflecting surfaces arranged within a spherical or cylindrical shell. These optics have two unique properties: they have unlimited fields of view and can be manufactured via replication of identical structures. Because the angular resolution is given by the ratio of the size of the individual optical elements to the focal...
Keywords: ARC DISCHARGES; ELECTRIC ARCS; SPACE DEBRIS; SPACE PLASMAS; SPACECRAFT CHARGING; CAPACITANCE; SPACE STATIONS
|Calculation of space charge forces in the analysis of traveling wave tubes - Detweiler, H. K|
Computer program for calculating space charge fields in design optimization of traveling wave tube
Keywords: DRIVES; ELECTRIC ARCS; MEMBRANE STRUCTURES; SHOCK TUBES; GAS DISCHARGES; SHOCK WAVE GENERATORS; SPACE SIMULATORS
|AERODYNAMICS AND FLIGHT DYNAMICS OF TURBOJET AIRCRAFT - LIGUM, T. I|
AERODYNAMICS AND FLIGHT DYNAMICS OF TURBOJET AIRCRAFT
Keywords: ELECTRIC ARCS; ELECTRICAL RESISTIVITY; HIGH TEMPERATURE AIR; THERMAL CONDUCTIVITY; THERMAL PLASMAS; ELECTRICAL MEASUREMENT; NITROGEN; TEMPERATURE MEASUREMENT
Downloads: 4,906 (3 reviews)
|Pressure distributions on a cylindrical surface behind shallow three-dimensional rearward-facing steps at Mach numbers from 0.4 to 1.3 - Capone, F. J|
Wind tunnel investigation of static pressure distributions along cylindrical surface behind shallow, three dimensional, rearward facing step of various heights
Keywords: ELECTRIC ARCS; ELECTRON BEAMS; ENERGY TRANSFER; GAS MIXTURES; NITROGEN; CARBON DIOXIDE; HIGH TEMPERATURE; MOLECULAR RELAXATION; RELAXATION (MECHANICS)
|New technologies for space avionics - Aibel, David W.|
This report reviews a 1994 effort that continued 1993 investigations into issues associated with the definition of requirements, with the practice concurrent engineering and rapid prototyping in the context of the development of a prototyping of a next-generation reaction jet driver controller. This report discusses lessons learned, the testing of the current prototype, the details of the current design, and the nature and performance of a mathematical model of the life cycle of a pilot operated...
Keywords: DAMAGE; ELECTRIC WIRE; ELECTRICAL INSULATION; KAPTON (TRADEMARK); SPACE SHUTTLE ORBITERS; SPACECRAFT CONSTRUCTION MATERIALS; ELECTRIC ARCS; ELECTRICAL FAULTS; WIRING
|Production of high plasma velocities by heating and self-magnetic acceleration in electric arcs - Peters, TH.|
Production of high plasma jet velocities by heating and self-magnetic acceleration in electric arcs
Keywords: ELECTRIC ARCS; HEATING; PLASMA ACCELERATION; PLASMA HEATING; PLASMA JETS; PLASMAS (PHYSICS); ELECTRIC ARC; PLASMA ACCELERATION; PLASMA JET
|Velocity of a plasma jet - Volk-Levanovich, M. V.|
Procedure for measuring velocity of plasma jet ejected from electric arc device
Keywords: ELECTRIC ARCS; VELOCITY MEASUREMENT; HIGH SPEED; PLASMA JETS; PLASMAS (PHYSICS); PLASMATRONS; VELOCITY MEASUREMENT; ARC JET; ELECTRIC ARC; PLASMA JET
|Vortex flow hysteresis - Cunningham, A. M., Jr|
An experimental study was conducted to quantify the hysteresis associated with various vortex flow transition points and to determine the effect of planform geometry. The transition points observed consisted of the appearance (or disappearance) of trailing edge vortex burst and the transition to (or from) flat plate or totally separated flows. Flow visualization with smoke injected into the vortices was used to identify the transitions on a series of semi-span models tested in a low speed tunnel...
Keywords: DIRECTIONAL SOLIDIFICATION (CRYSTALS); CRYSTALLIZATION; ELECTRODES; SILICON CARBIDES; SYNTHESIS (CHEMISTRY); ELECTRIC ARCS; FABRICATION; FURNACES; IMPURITIES; SILICON; SOLAR CELLS; BORON; CRYSTAL DEFECTS
|Effect of axial flow on the behavior of the wall-constricted arc - Shepard, C. E.|
Axial flow effects on behavior of wall constricted arc
Keywords: COAXIAL FLOW; TRANSPORT PROPERTIES; ELECTRIC ARCS; GAS FLOW; NUMERICAL ANALYSIS; PERFORMANCE PREDICTION; CONFERENCES; CONSTRICTIONS; DIRECT CURRENT; SUPERSONIC JET FLOW
|Relative operating capabilities of selected electric-arc reentry environment simulators - Clark, C. F.|
Operating envelopes of supersonic electric arc air heaters for reentry environment simulators
Keywords: ABLATION; SIMULATOR; ARC HEATING; ELECTRIC ARCS; ENVIRONMENT SIMULATORS; HEATERS; HEATING EQUIPMENT; REENTRY EFFECTS; ARC HEATING; REENTRY CONDITION
|On the equilibrium sonic flow method for evaluationg electric-arc air-heater performance - Winovich, W|
Equilibrium sonic flow method of evaluating electric arc air heater performance
Keywords: ARC HEATING; HEATER; SONIC FLOW; ELECTRIC ARCS; ENTHALPY; EQUILIBRIUM FLOW; HEATERS; HEATING EQUIPMENT; TRANSONIC FLOW; ELECTRIC ARC; EQUILIBRIUM FLOW
|The shape of a magnetically rotated electric arc column in an annular gap - Jedlicka, J. R|
Shape of electric arc discharge rotated in annular gap by external magnetic field
Keywords: ANNULI; SPARK GAP; ARC DISCHARGES; ELECTRIC ARCS; MAGNETIC FIELDS; SHAPES; SPARK GAPS; ARC DISCHARGE; ELECTRIC ARC; MAGNETIC FIELD
|Autonomous Evolution of Dynamic Gaits with Two Quadruped Robots - Hornby, Gregory S.|
A challenging task that must be accomplished for every legged robot is creating the walking and running behaviors needed for it to move. In this paper we describe our system for autonomously evolving dynamic gaits on two of Sony's quadruped robots. Our evolutionary algorithm runs on board the robot and uses the robot's sensors to compute the quality of a gait without assistance from the experimenter...
Keywords: SEASAT 1; ELECTRIC ARCS; FAILURE MODES; FAILURE ANALYSIS; ACCIDENT INVESTIGATION; SYSTEM FAILURES; SPACECRAFT POWER SUPPLIES; SPACECRAFT DESIGN; BRUSHES (ELECTRICAL CONTACTS); SHORT CIRCUITS
|The Properties of the local Interstellar Medium and the Interaction of the Stellar Winds of epsilon Indi and lambda Andromedae with the Interstellar Environment - Wood, Brian E.|
We present new observations of the Ly alpha lines of Epsilon Indi (K5 5) and A Andromedae (G8 4-3 ) These data were obtained by the Goddard High Resolution Spectrograph (GHRS) on the Hubble Space Telescope. Analysis of the interstellar H 1 and D 1 absorption lines reveals that the velocities and temperatures inferred from the H 1 lines are inconsistent with the parameters inferred from the D 1 lines, unless the H 1 absorption is assumed to be produced by two absorption components...
Keywords: PHOTOVOLTAIC CELLS; PLASMA INTERACTIONS; SOLAR ARRAYS; SPACE PLASMAS; INTERNATIONAL SPACE STATION; ELECTRIC ARCS; ARC DISCHARGES; HIGH PRESSURE; CHARGE TRANSFER; ELECTRIC POTENTIAL
|Numerical Modeling of High-Temperature Corrosion Processes - Nesbitt, James A|
Numerical modeling of the diffusional transport associated with high-temperature corrosion processes is reviewed. These corrosion processes include external scale formation and internal subscale formation during oxidation, coating degradation by oxidation and substrate interdiffusion, carburization, sulfidation and nitridation. The studies that are reviewed cover such complexities as concentration-dependent diffusivities, cross-term effects in ternary alloys, and internal precipitation where sev...
Keywords: OXYGEN; COMPRESSION LOADS; SYSTEMS ENGINEERING; SAFETY FACTORS; VIBRATION EFFECTS; TEST FACILITIES; PERFORMANCE PREDICTION; FLAMMABILITY; HAZARDS; COMBUSTION; IGNITION; ELECTRIC ARCS; CHEMICAL REACTIONS; RISK; ADIABATIC CONDITIONS
|EFFECT OF SLIGHT BLUNTING OF LEADING EDGE OF AN IMMERSED BODY ON THE FLOW AROUND IT AT HYPERSONIC SPEEDS - CHERNYI, G. G|
A THEORETICAL INVESTIGATION OF THE FLOW ABOUT BLUNT LEADING-EDGE BODIES, IMMERSED IN A HYPERSONIC STREAM OF ANY GAS IS UNDERTAKEN. THE STUDY UTILIZES PISTON AND BLAST-WAVE THEORY TO STUDY THE FLOW ABOUT SUCH SHAPES AS A BLUNT LEADING-EDGE SLAB, A BLUNT-NOSED CYLINDRICAL ROD, A THIN WEDGE WITH A BLUNT LEADING EDGE, AND A THIN BLUNT-NOSED CONE. EXPRESSIONS ARE OBTAINED FOR PREDICTING THE SURFACE PRESSURE DISTRIBUTION, THE SHAPE OF THE BOW SHOCK, AND THE DRAG OF THESE BODIES, AND THESE THEORETICAL ...
Keywords: FABRICATION; MAGNETIC FLUX; MAGNETIC FIELDS; GRAPHITE; FLUX DENSITY; ANODES; CATHODES; ELECTRODES; HEAT MEASUREMENT; LOSSES; FAILURE; COOLING; ELECTRIC ARCS; WIND TUNNEL TESTS; TUNGSTEN
|Future Trends in Antennas and Propagation for the US Space Program - Krishen, Kuma|
A key role of NASA (the US National Aeronautics and Space Administration) is to plan and execute programs, aimed at understanding the universe and matter, and the processes that underlie the development and evolution of life and the planet Earth. The part played by electromagnetic (EM) systems in information and energy transfer, and the tracking and imaging of objects and scenes, has been crucial to the successes of the space programs of various nations, to date...
Keywords: OXYGEN ATOMS; RAMAN LASERS; RARE GAS-HALIDE LASERS; ULTRAVIOLET ABSORPTION; ABSORPTION SPECTROSCOPY; ELECTROMAGNETIC ABSORPTION; GAS DENSITY; ELECTRIC ARCS; EXCIMER LASERS; FAR ULTRAVIOLET RADIATION; LASER SPECTROSCOPY
|A magnetically rotated electric arc air heater employing a strong magnetic field and copper electrodes - Mayo, R. F.|
Magnetically rotated electric arc air heater using strong magnetic field and copper electrodes
Keywords: ARC HEATING; COPPER; ELECTRIC ARC; ELECTRODE; HEATER; MAGNETIC FIELD; COPPER; ELECTRIC ARCS; ELECTRODES; HEATERS; HEATING EQUIPMENT; MAGNETIC FIELDS; MAGNETIC PROPERTIES; THROATS
|Use of the emission spectrum of the copper atom for plasma diagnostics - Bakanovich, G. I.|
Charged particle concentration and temperature in dc arc burning under water determined from emission spectrum of copper
Keywords: CHARGED PARTICLES; WATER; CHARGED PARTICLE; COPPER; DIRECT CURRENT /DC/; ELECTRIC ARC; EMISSION SPECTRUM; PLASMA TEMPERATURE; COMBUSTION; COPPER; DIRECT CURRENT; ELECTRIC ARCS; EMISSION SPECTRA; METALLIC PLASMAS; PLASMA DIAGNOSTICS; PLASMA TEMPERATURE
|The 2nd NASA Aerospace Pyrotechnic Systems Workshop - NON|
This NASA Conference Publication contains the proceedings of the Second NASA Aerospace Pyrotechnics Systems Workshop held at Sandia National Laboratories, Albuquerque, New Mexico, February 8-9, 1994. The papers are grouped by sessions: (1) Session 1 - Laser Initiation and Laser Systems; (2) Session 2 - Electric Initiation; (3) Session 3 - Mechanisms & Explosively Actuated Devices; (4) Session 4 - Analytical Methods and Studies; and (5) Session 5 - Miscellaneous...
Keywords: ABSORPTION SPECTROSCOPY; SPECTRUM ANALYSIS; ELECTRIC ARCS; SHOCK WAVES; ARGON LASERS; TUNABLE LASERS; LINE SHAPE; LINE SPECTRA; RAMAN SPECTRA; ULTRAVIOLET ABSORPTION; ULTRAVIOLET RADIATION; OXYGEN ATOMS; SHOCK TUBES; VACUUM SPECTROSCOPY; EXCIMER LASERS; RARE GAS-HALIDE LASERS; LASER SPECTROSCOPY